On the photoproduction reactions γd → πNN

A review of our works providing a theoretical description of incoherent pion photoproduction on the deuteron is presented. The existing gamma d -> pi NN data are analysed, especially those obtained more recently by the CLAS Collaboration at JLab, the A2 Collaboration at MAMI at Mainz, and the PION@MAX-lab Collaboration at Lund. A procedure, which accounts for the final-state interactions (FSI), is applied to extract gamma n -> pi N differential cross sections from the deuteron data. The role of FSI is discussed. We also comment on the results of other works in connection with some discrepancies seen in comparing the model with experiment. The electromagnetic properties of baryon N* resonances, improved using the extracted gamma n -> pi N differential cross sections are presented. A model description of the cross section data from charged-pion photoproduction reactions gamma d -> pi(NN)-N-+/- near threshold is also given. The gamma d -> pi(-)pp data are used to extract the E0+ multipole and total cross section of the reaction gamma n -> pi(-)p near threshold.

Automated summary

In this review, we focus on providing a theoretical description of incoherent pion photoproduction on the deuteron. We analyze existing data on gamma d -> pi NN, particularly recent data obtained by various collaborations. By applying a procedure that accounts for final-state interactions (FSI), we extract gamma n -> pi N differential cross sections from the deuteron data. The role of FSI and discrepancies between model and experimental results are discussed. We also present improved electromagnetic properties of baryon N* resonances using the extracted differential cross sections. Furthermore, we provide a model description of the cross section data for charged-pion photoproduction reactions near threshold, and extract the E0+ multipole and total cross section for the reaction gamma n -> pi(-)p from gamma d -> pi(-)pp data near threshold.